since i was hit with a schedule change today my question is......

how far in advance do you get informed about a schedule change. "for us" it's roughly about 6 weeks before "no more changes"

also, where "we" have been victims of a/c swaps and sometimes not knowing until we arrive at the airport, how far in advance do you find out and if from one a/c that you drive to one that you don't drive, what does that do/how does that affect your bidding and/or hours?